Results 91 to 100 of about 17,015 (215)

Spatially resolved spectroscopy across stellar surfaces. I. Using exoplanet transits to analyze 3-D stellar atmospheres

, 2017
CONTEXT: High-precision stellar analyses require hydrodynamic modeling to interpret chemical abundances or oscillation modes. Exoplanet atmosphere studies require stellar background spectra to be known along the transit path while detection of Earth ...
Dahlén, Erik, Dravins, Dainis, Ludwig, Hans-Günter, Pazira, Hiva   +3 more
core   +2 more sources

The Compositions of the HR 8799 Planets Reflect Accretion of Both Solids and Metal-enriched Gas

The Astrophysical Journal
With four giant planets ( m  ∼ 5 M _Jup −10 M _Jup , T _eff  ∼ 900–1200 K) orbiting between 15 and 70 au, HR 8799 provides an unparalleled test bed for studying giant planet formation and probing compositional trends across the protoplanetary disk.
Jerry W. Xuan, Jean-Baptiste Ruffio, Yayaati Chachan, Kazumasa Ohno, Aurora Kesseli, Ruth Murray-Clay, Eve J. Lee, Julianne I. Moses, William O. Balmer, Aneesh Baburaj, Geoffrey A. Blake, Doug Johnstone, Yapeng Zhang, Heather A. Knutson, Dimitri Mawet, Charles Beichman, Klaus Hodapp, Marshall D. Perrin, Quinn Konopacky, Michael Meyer, Geoffrey Bryden, Thomas P. Greene, Jarron Leisenring, Marie Ygouf, Björn Benneke, Julie Inglis, Nicole L. Wallack   +26 more
doaj   +1 more source

C/O Ratios and the Formation of Wide-separation Exoplanets

The Astrophysical Journal Letters
Abstract The gas and solid-state C/O ratios provide context to potentially link the atmospheric composition of planets to that of the natal disk. We provide a synthesis of extant estimates of the gaseous C/O and C/H ratios in planet-forming disks obtained primarily through analysis of Atacama Large Millimeter/submillimeter Array ...
Edwin A. Bergin, Richard A. Booth, Maria Jose Colmenares, John D. Ilee   +3 more
openaire   +4 more sources

Dependence of Planet Populations on Stellar Mass and Metallicity: A Pebble-accretion-based Planet Population Synthesis Model

The Astrophysical Journal
The formation and evolution of planetary systems are linked to their host stellar environment. In this study, we employ a pebble-accretion-based planet population synthesis model to explore the correlation between planetary properties and stellar mass ...
Mengrui Pan, Beibei Liu, Linjie Jiang, Jiwei Xie, Wei Zhu, Ignasi Ribas   +5 more
doaj   +1 more source

Search for giant planets in M67 I. Overview

, 2012
Precise stellar radial velocities are used to search for massive (Jupiter masses or higher) exoplanets around the stars of the open cluster M67. We aim to obtain a census of massive exoplanets in a cluster of solar metallicity and age in order to study ...
A. Brucalassi, Baranne, Baumann, Belloni, Bouchy, Bramich, Bruntt, Burke, C. Lovis, C. Melo, De Silva, Dumusque, Freeman, Gilliland, Girard, Girardi, Gonzalez, Gonzalez Hernandez, Hartman, Haywood, Hekker, Israelian, Johnson, K. Biazzo, Kjeldsen, L. Pasquini, L. R. Bedin, Latham, Laughlin, Lindegren, Lovis, M. T. Ruiz, Magic, Mathieu, Mathieu, Mayor, Mayor, Melendez, Melo, Mochejska, Mochejska, Molaro, Molaro, Montalto, Montalto, Montgomery, Nascimbeni, P. Bonifacio, Pace, Pasquini, Pasquini, Pasquini, Pasquini, Pasquini, Paulson, Paulson, Pollack, R. Saglia, Randich, Randich, S. Randich, Saar, Sanders, Sandquist, Sandquist, Sandquist, Santos, Sato, Setiawan, Street, Taylor, Tull, Van den Berg, van Saders, von Braun, Weldrake, Weldrake, Yadav, Önehag   +78 more
core   +4 more sources

Testing the Origin of Hot Jupiters with Atmospheric Surveys

The Astrophysical Journal
In spite of their long detection history, the origin of hot Jupiters remains to be resolved. While dynamical evidence suggests high-eccentricity migration is most likely, conflicts remain when considering hot Jupiters as a population in the context of ...
Lina D’Aoust, Ben Coull-Neveu, Eve J. Lee, Nicolas B. Cowan   +3 more
doaj   +1 more source

The Architectural Design Rules of Solar Systems based on the New Perspective

, 2009
On the basis of the Lunar Laser Ranging Data released by NASA on the Silver Jubilee Celebration of Man Landing on Moon on 21st July 1969-1994, theoretical formulation of Earth-Moon tidal interaction was carried out and Planetary Satellite Dynamics was ...
A Johnson, AN Halliday, Bijay Kumar Sharma, BK Sharma, C Broeg, C Hellier, CL Cook, D Apes, DD Sasselov, DD Sasselov, DP Rubicam, F Marzari, G Israelian, GA Krasinsky, GA Krasinsky, GE Williams, GH Darwin, GH Darwin, H Tanaka, JE Chambers, JJ Dukla, JJ Lissauer, JP Zahn, KJ Epstein, M Reidemeister, ME Zolansky, N Murray, NC Santos, P Goldreich, RP Nelson, S Ida, S Leschiutta, SN Cuzzi, T Jong de   +33 more
core   +1 more source

Resonant and Ultra-short-period Planet Systems Are at Opposite Ends of the Exoplanet Age Distribution

The Astronomical Journal
Exoplanet systems are thought to evolve on secular timescales over billions of years. This evolution is impossible to directly observe on human timescales in most individual systems.
Stephen P. Schmidt, Kevin C. Schlaufman, Jacob H. Hamer   +2 more
doaj   +1 more source

Characterisation of exoplanet host stars: A window into planet formation [PDF]

Proceedings of the International Astronomical Union, 2017
AbstractThe detection of thousands of planets orbiting stars other than the Sun has shown that planets are common throughout the Galaxy. However, the diversity of systems found has also raised many questions regarding the process of planet formation and evolution. Interestingly, but perhaps not unexpectedly, crucial information to constraint the planet
openaire   +1 more source

Peas-in-a-pod across the Radius Valley: Rocky Systems Are Less Uniform in Mass but More Uniform in Size and Spacing

The Astrophysical Journal Letters
The ubiquity of “peas-in-a-pod” architectural patterns and the existence of the radius valley each presents a striking population-level trend for planets with R _p ≤ 4 R _⊕ that serves to place powerful constraints on the formation and evolution of these
Armaan V. Goyal, Songhu Wang
doaj   +1 more source